To provide a polygonal scanner equipped with a printed board, which suppresses dispersion of the rotational position of a rotor and also is easy to wire a drive circuit.

This motor suppresses the positional dispersion of a bearing to a mounting reference plane to be small, and suppress the dispersion of the rotational position (radial direction and vertical direction) of the rotor small, by providing a mounting reference to a radial dynamic pressure air bearing and an axial bearing integrally with the mounting reference plane made at a housing 101, and attaching each fixed part directly to a housing 101. Moreover, the circuit design of the board is facilitated by equipped itself with a board 104, which blocks the through part 101b of the housing 101 from the outside, a position detecting element 103 which is mounted on the board, and a drive circuit board 122 which is connected to a board via a connector 123 mounted on the board, and also cooling effect is enhanced by arranging a drive element outside the sealed space, and it can be used even at high revolution.